@poco, @eelik, @gkeeth,
I reinstalled yesterday’s unified nightly after a thorough search and destroy. I took the default configuration and, voila, it all seems to be working nicely. Thanks much for all the patient help! I’m marking this RESOLVED.
BTW, there’s a nice post by @eelik from 2019 in the FAQ about configuration files. Seems worth updating and expanding for KiCad 6 if you have the time.